var pictures = new Array("avila.jpg","canyon.jpg","castle.jpg","sedona.jpg","tree.jpg","whitney.jpg","windmills.jpg","beetle.jpg","butterfly.jpg");
var cur_pic=0;

function randomNumber(max){
	//return a random integer between 0 and max
	return Math.floor(Math.random()*(max+1))

}

function showThumb(){
	cur_pic=randomNumber(pictures.length-1);
	document.write("<img onclick=\"switchThumb(this);\" src=\"logos/"+pictures[cur_pic]+"\"/>");
}

function switchThumb(img){
	while(cur_pic==(new_pic=randomNumber(pictures.length-1)));
	cur_pic=new_pic;
	img.src="logos/"+pictures[cur_pic];
}